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Title: Quantitative experimental determination of the solid solution hardening potential of rhenium, tungsten and molybdenum in single-crystal nickel-based superalloys

Journal Article · · Acta Materialia
 [1];  [2];  [3];  [1]
  1. Univ. Bayreuth, Bayreuth (Germany)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. MTU Aero Engines AG, Munchen (Germany)

Here, the solid-solution hardening potential of the refractory elements rhenium, tungsten and molybdenum in the matrix of single-crystal nickel-based superalloys was experimentally quantified. Single-phase alloys with the composition of the nickel solid-solution matrix of superalloys were cast as single crystals, and tested in creep at 980 °C and 30–75 MPa. The use of single-phase single-crystalline material ensures very clean data because no grain boundary or particle strengthening effects interfere with the solid-solution hardening. This makes it possible to quantify the amount of rhenium, tungsten and molybdenum necessary to reduce the creep rate by a factor of 10. Rhenium is more than two times more effective for matrix strengthening than either tungsten or molybdenum. The existence of rhenium clusters as a possible reason for the strong strengthening effect is excluded as a result of atom probe tomography measurements. If the partitioning coefficient of rhenium, tungsten and molybdenum between the γ matrix and the γ' precipitates is taken into account, the effectiveness of the alloying elements in two-phase superalloys can be calculated and the rhenium effect can be explained.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1185435
Journal Information:
Acta Materialia, Vol. 87; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 96 works
Citation information provided by
Web of Science

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Cited By (12)

Phase-Field Modeling of Precipitation Growth and Ripening During Industrial Heat Treatments in Ni-Base Superalloys journal July 2018
MultOpt++: a fast regression-based model for the constraint violation fraction due to composition uncertainties journal January 2019
Microstructure and Mechanical Properties of Precipitate Strengthened High Entropy Alloy Al10Co25Cr8Fe15Ni36Ti6 with Additions of Hafnium and Molybdenum journal February 2019
Development of strong, oxidation and corrosion resistant nickel-based superalloys: critical review of challenges, progress and prospects journal October 2018
Kinetic Monte Carlo simulations of vacancy diffusion in nondilute Ni- X ( X = Re, W, Ta) alloys journal December 2018
Critical assessment 31: on the modelling of tertiary creep in single-crystal superalloys journal June 2018
Design of Re-free nickel-base single crystal superalloys using modelling and experimental validations journal May 2019
Unveiling the Re effect in Ni-based single crystal superalloys text January 2020
Stress Concentration Induced by the Crystal Orientation in the Transient-Liquid-Phase Bonded Joint of Single-Crystalline Ni3Al journal August 2019
Effects of Solid Solution Strengthening Elements Mo, Re, Ru, and W on Transition Temperatures in Nickel-Based Superalloys with High γ′-Volume Fraction: Comparison of Experiment and CALPHAD Calculations journal June 2018
DAMASK – The Düsseldorf Advanced Material Simulation Kit for modeling multi-physics crystal plasticity, thermal, and damage phenomena from the single crystal up to the component scale journal February 2019
Unveiling the Re effect in Ni-based single crystal superalloys journal January 2020

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